Supplemental Cash Flow Information (Summary Of Non-Cash Investing And Financing Activities)(Details) - USD ($) $ in Thousands	9 Months Ended
Sep. 30, 2015	Sep. 30, 2014
Noncash or Part Noncash Acquisitions [Line Items]
Accrued property construction costs	$ 6,935	$ 4,775
Increase in equity for the acquisition of noncontrolling interests in consolidated real estate joint ventures	0	11,015
Exchange of operating partnership units for common shares	111	0
Decrease in notes receivable from real estate joint ventures and partnerships in association with our contribution in an unconsolidated real estate joint venture	0	(6,431)
Property Acquisitions And Investments In Unconsolidated Real Estate Joint Ventures [Member]
Noncash or Part Noncash Acquisitions [Line Items]
Increase in debt, net	20,116	0
Sale Of Property And Property Interest [Member]
Noncash or Part Noncash Acquisitions [Line Items]
Decrease in property, net	0	(127,837)
Decrease in real estate joint ventures and partnerships - investments	0	(17)
Decrease in other, net	0	(34)
Decrease in debt, net due to debt assumption	0	(11,069)
Decrease in security deposits	0	(459)
Decrease in noncontrolling interests	$ 0	$ (155,278)

Future cash outflow to pay for construction in progress expenditures that have occurred.

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